Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

Never check between wheel sensor harness connector terminals.

CHECK WHEEL SENSOR
1. Turn the ignition switch OFF.
2. Check the wheel sensor for damage.
Is the inspection result normal?

YES

GO TO STEP 3 .

NO

GO TO STEP 2 .

REPLACE WHEEL SENSOR (1)

With CONSULT
1. Replace the wheel sensor.
  - Front: Refer to REMOVAL AND INSTALLATION .
  - Rear: Refer to REMOVAL AND INSTALLATION .
2. Erase self-diagnosis result for "ABS".
3. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
4. Set the vehicle to READY/Start the engine.
5. Drive the vehicle at approx. 50 km/h (31 MPH) or more for approx. 2 minutes.
  NOTE:
  Vehicle must be driven after repair or replacement to erase the previous DTCs.
6. Stop the vehicle.
7. Turn the ignition switch OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF.
8. Set the vehicle to READY/Start the engine.
  NOTE:
  Wait at least 10 seconds after set the vehicle to READY/start the engine.
9. Repeat step 7 to 8 two or more times.
10. Perform self-diagnosis for "ABS".
Is DTC "C1101", "C1102", "C1103" or "C1104" detected?

YES

GO TO STEP 3 .

NO

INSPECTION END

CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.
3. Check the wheel sensor harness connector for disconnection or looseness.
Is the inspection result normal?

YES

GO TO STEP 5 .

NO

Repair / replace harness or connector, securely lock the connector, and GO TO STEP 4 .

PERFORM SELF-DIAGNOSIS (1)

With CONSULT
1. Erase self-diagnosis result for "ABS".
2. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
3. Set the vehicle to READY/Start the engine.
4. Drive the vehicle at approx. 50 km/h (31 MPH) or more for approx. 2 minutes.
  NOTE:
  Vehicle must be driven after repair or replacement to erase the previous DTCs.
5. Stop the vehicle.
6. Turn the ignition switch OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF.
7. Set the vehicle to READY/Start the engine.
  NOTE:
  Wait at least 10 seconds after set the vehicle to READY/start the engine.
8. Repeat step 6 to 7 two or more times.
9. Perform self-diagnosis for "ABS".
Is DTC "C1101", "C1102", "C1103" or "C1104" detected?

YES

GO TO STEP 5 .

NO

INSPECTION END

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY AND GROUND CIRCUIT

Check the ABS actuator and electric unit (control unit) power supply and ground circuit. Refer to DIAGNOSIS PROCEDURE .

Is the inspection result normal?

YES

GO TO STEP 6 .

NO

Repair / replace harness, connector, fuse, or fusible link.

CHECK TERMINAL
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector and then check the ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness connector.
3. Disconnect wheel sensor harness connector and check each wheel sensor pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

GO TO STEP 8 .

NO

Repair / replace harness, connector, or terminal, and GO TO STEP 7 .

PERFORM SELF-DIAGNOSIS (2)

With CONSULT
1. Connect ABS actuator and electric unit (control unit) harness connector.
2. Connect wheel sensor harness connector.
3. Erase self-diagnosis result for "ABS".
4. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
5. Set the vehicle to READY/Start the engine.
6. Drive the vehicle at approx. 50 km/h (31 MPH) or more for approx. 2 minutes.
  NOTE:
  Vehicle must be driven after repair or replacement to erase the previous DTCs.
7. Stop the vehicle.
8. Turn the ignition switch OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF.
9. Set the vehicle to READY/Start the engine.
  NOTE:
  Wait at least 10 seconds after set the vehicle to READY/start the engine.
10. Repeat step 8 to 9 two or more times.
11. Perform self-diagnosis for "ABS".
Is DTC "C1101", "C1102", "C1103" or "C1104" detected?

YES

GO TO STEP 8 .

NO

INSPECTION END

CHECK WHEEL SENSOR HARNESS

Turn the ignition switch OFF.
Disconnect ABS actuator and electric unit (control unit) harness connector.
Disconnect wheel sensor harness connector.

Check the continuity between ABS actuator and electric unit (control unit) harness connector and wheel sensor harness connector. (Check the continuity while turning steering wheel left and right, or while moving center harness in wheel housing.)

Measurement connector and terminal for power supply circuit

ABS actuator and electric unit (control unit)		Wheel sensor			Continuity
Connector	Terminal	Connector		Terminal	Continuity
E24	23	E48	(Front LH wheel)	2	Existed
	21	E54	(Front RH wheel)
	26	C6	(Rear LH wheel)
	11	C5	(Rear RH wheel)

Measurement connector and terminal for signal circuit

ABS actuator and electric unit (control unit)		Wheel sensor			Continuity
Connector	Terminal	Connector		Terminal	Continuity
E24	27	E48	(Front LH wheel)	1	Existed
	12	E54	(Front RH wheel)
	30	C6	(Rear LH wheel)
	15	C5	(Rear RH wheel)

Is the inspection result normal?

YES

GO TO STEP 10 .

Repair / replace harness or connector, and GO TO STEP 9 .

PERFORM SELF-DIAGNOSIS (3)

With CONSULT
1. Connect ABS actuator and electric unit (control unit) harness connector.
2. Connect wheel sensor harness connector.
3. Erase self-diagnosis result for "ABS".
4. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
5. Set the vehicle to READY/Start the engine.
6. Drive the vehicle at approx. 50 km/h (31 MPH) or more for approx. 2 minutes.
  NOTE:
  Vehicle must be driven after repair or replacement to erase the previous DTCs.
7. Stop the vehicle.
8. Turn the ignition switch OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF.
9. Set the vehicle to READY/Start the engine.
  NOTE:
  Wait at least 10 seconds after set the vehicle to READY/start the engine.
10. Repeat step 8 to 9 two or more times.
11. Perform self-diagnosis for "ABS".
Is DTC "C1101", "C1102", "C1103" or "C1104" detected?

YES

GO TO STEP 10 .

NO

INSPECTION END

CHECK WHEEL SENSOR OUTPUT SIGNAL
1. Disconnect ABS actuator and electric unit (control unit) harness connector.
2. Disconnect wheel sensor harness connector.
3. Connect ABS active wheel sensor tester (SST: J-45741-A) to wheel sensor using appropriate adapter.
4. Turn the ABS active wheel sensor tester power switch ON.
  NOTE:
  The green POWER indicator should illuminate. If the POWER indicator does not illuminate, replace the battery in the ABS active wheel sensor tester before proceeding.
5. Spin the wheel of the vehicle by hand and observe the red SENSOR indicator on the ABS active wheel sensor tester. The red SENSOR indicator should flash ON and OFF to indicate an output signal.
  NOTE:
  If the red SENSOR indicator illuminates but does not flash, reverse the polarity of the tester leads and retest.
Does the ABS active wheel sensor tester detect a signal?

YES

Replace the ABS actuator and electric unit (control unit). Refer to REMOVAL AND INSTALLATION .

NO

GO TO STEP 11 .

REPLACE WHEEL SENSOR

With CONSULT
1. Replace the wheel sensor.
  - Front: Refer to REMOVAL AND INSTALLATION .
  - Rear: Refer to REMOVAL AND INSTALLATION .
2. Connect ABS actuator and electric unit (control unit) harness connector.
3. Erase self-diagnosis result for "ABS".
4. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
5. Set the vehicle to READY/Start the engine.
6. Drive the vehicle at approx. 50 km/h (31 MPH) or more for approx. 2 minutes.
  NOTE:
  Vehicle must be driven after repair or replacement to erase the previous DTCs.
7. Stop the vehicle.
8. Turn the ignition switch OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF.
9. Set the vehicle to READY/Start the engine.
  NOTE:
  Wait at least 10 seconds after set the vehicle to READY/start the engine.
10. Repeat step 8 to 9 two or more times.
11. Perform self-diagnosis for "ABS".
Is DTC "C1101", "C1102", "C1103" or "C1104" detected?

YES

Replace the ABS actuator and electric unit (control unit). Refer to REMOVAL AND INSTALLATION .

NO

INSPECTION END